TY - GEN
T1 - Baltic Sea Mass Variations from GRACE
T2 - IAG International Symposium on "Gravity, Geoid and Earth Observation"
AU - Virtanen, J.
AU - Mäkinen, J.
AU - Bilker-Koivula, M.
AU - Virtanen, Heikki
AU - Nordman, M.
AU - Kangas, Antti
AU - Johansson, M.
AU - Shum, C. K.
AU - Lee, H.
AU - Wang, L.
AU - Thomas, M.
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The monthly variation in the water mass of the semi-enclosed Baltic Sea is about 60 Gt RMS over an area of 390,000km2. The Baltic has a dense network of tide gauges (TGs), and several high-resolution regional hydrodynamic models, making it one of the best-monitored seas for mass variations of this size in the world. We investigate the performance of different GRACE gravity field solutions to recover this oceanic mass variation using in situ measurements of sea-level heights. For GRACE, we use both the standard monthly solutions as well as regional solutions to estimate the total water storage in the Baltic Sea. For the "ground truth", we use sea-level measurements in the network of tide gauges around the Baltic Sea. For comparison, we have access to data from two hydrodynamic models. The water mass estimated from the constructed sea surfaces is then compared with different GRACE estimates. At present, we ignore the steric anomalies, as they are small in the Baltic Sea. We also discuss the "leakage" between land hydrology and the Baltic Sea in the GRACE estimates of water storage.
AB - The monthly variation in the water mass of the semi-enclosed Baltic Sea is about 60 Gt RMS over an area of 390,000km2. The Baltic has a dense network of tide gauges (TGs), and several high-resolution regional hydrodynamic models, making it one of the best-monitored seas for mass variations of this size in the world. We investigate the performance of different GRACE gravity field solutions to recover this oceanic mass variation using in situ measurements of sea-level heights. For GRACE, we use both the standard monthly solutions as well as regional solutions to estimate the total water storage in the Baltic Sea. For the "ground truth", we use sea-level measurements in the network of tide gauges around the Baltic Sea. For comparison, we have access to data from two hydrodynamic models. The water mass estimated from the constructed sea surfaces is then compared with different GRACE estimates. At present, we ignore the steric anomalies, as they are small in the Baltic Sea. We also discuss the "leakage" between land hydrology and the Baltic Sea in the GRACE estimates of water storage.
UR - http://www.scopus.com/inward/record.url?scp=84884374697&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-10634-7_76
DO - 10.1007/978-3-642-10634-7_76
M3 - Conference contribution
AN - SCOPUS:84884374697
SN - 9783642106330
T3 - International Association of Geodesy Symposia
SP - 571
EP - 577
BT - Gravity, Geoid and Earth Observation - IAG Commission 2
Y2 - 23 June 2008 through 27 June 2008
ER -